Wolfram: Get SubString, by Pattern
Get All Matches
StringCases[str, pattern]
-
Get a list of substrings that match a pattern.
〔see Regular Expression〕
(* extract email address *) x = "emails john842194@gmail.com and mary441193@yahoo.com etc"; StringCases[ x, RegularExpression[ "[a-z0-9]+@[a-z0-9]+\\.com" ], IgnoreCase -> True] (* {john842194@gmail.com, mary441193@yahoo.com} *)
StringCases[str, pattern :> replaceBy]
-
Get a list of substrings that match a pattern, and replace each by replaceBy
(* get total number of colored balls *) xx = "Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green"; StringCases[xx, RegularExpression["([0-9]+) (red|green|blue)"] :> ToExpression[ "$1" ] ] (* {8, 6, 20, 5, 4, 13} *)
Get All Positions
StringPosition
-
get a list of beginning and end positions.
StringPosition[ "x331 x71 59", RegularExpression["x[0-9]+"] ] (* {{1, 4}, {6, 8}} *)
Count Occurrence
StringCount
-
get number of occurrence of a string pattern.
StringCount[ "x331 x71 59", RegularExpression["x[0-9]+"] ] (* 2 *)
WolframLang String
- Wolfram: String
- Wolfram: String Functions
- Wolfram: Get SubString, by Index
- Wolfram: Get SubString, by Pattern
- Wolfram: Delete SubString
- Wolfram: String Split
- Wolfram: String Join
- Wolfram: String Insert
- Wolfram: Convert String
- Wolfram: String Template (format)
- Wolfram: String Match
- Wolfram: String Replace
- Wolfram: Regular Expression
- Wolfram: String Expression
- Wolfram: StringExpression Pattern Syntax
- Wolfram: RegularExpression vs StringExpression